40 years ago every car on the road was dirty and now, at least in CA, they are much much cleaner because people complained. The fact that diesels trucks have b

40 years ago every car on the road was dirty and now, at least in CA, they are much much cleaner because people complained. The fact that diesels trucks have been exempted from these same regulations is an embarrassment akin to Lee Iacocca telling Nixon that seat belt requirements would put Chrysler out of business.